Mr. Justice Stone delivered the opinion of the Court. Certiorari was granted to review a decree of the Circuit Court of Appeals for the Eighth Circuit, 70 F. (2d) 564, which reversed the decree of the district court and held valid, but not infringed, the first claim of the Smith Patent, No. 1,262,860, of April 16, 1918, for an improved apparatus and method for th…
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